Electric pocket lamp



Dec. 26, 1922.

A. LUZY.

ECTRIC POCKET LAMP.

HLED lULY 29. I920.

magnetic loss and Patented Dec. 26, 1922.

UNITED STATES ANTOINE LUZY, OF PARIS, FRANCE.

ELECTRIC POCKET LAMP.

Application 11161! Iuly 29, 1920. Serial N0. 399,686.

To all whom it may concewt:

Be it known that I, ANTOINE L-UzY, a citizen of the French Republic, and resident of 34 Rue Sol-bier, Paris, France, have invented certain new and useful Improvements in Electric Pocket Lamps, of which the following is a specification.

The present invention relates to an electric pocket lamp with an electro-magnetic generator having a fixed secondary or armature and permanent rotating field magnets, in which centrifugal force is utilized to produce variation in the electrical output of the generator in proportion to the speed of the rotating magnet and thus effect regulation of the induced electro-motive force.

The principal object of the invention is to construct a centrifugal regulating apparatus in which the rotating field magnet is composed of two parts which are moved by centrifugal force in translation whereby to maintain the spark gap very nearly constant over its entire len th, and thereby eliminate insure greater efiiciency.

A further object of the invention is to guide the movement of the magnets in such manner that they move laterally with respect to each other and in a direction determined according to the mnuber of the poles of the magnet.

A still further object resides in the provision of the field magnets along a diametrical line, so that when separated from each other, poles are created whose attraction is opposed to the centrifugal force.

In the accompanying drawing wherein an improved embodiment of the invention is illustrated Figure l is a side elevation of the electric pocket lamp, partly in section;

Figure 2 is an edge elevation thereof partly in section;

Figures 3 and 4 are, respectively, a front elevation and a cross section of a multiple polar magnet constituted by two fixed bipolar elements.

Fig. 5 shows in elevation at multiple magnet constituted by three fixed bipolar elements.

Figs. 6 and 7 are respectively a front elevation and a cross-section of a bipolar magnot built for the purpose of ensuring an automatic regulation of the current.

Fig. 8 shows in elevation a multiple magnet also arranged so as to ensure automatic regulation of the current. I

The operating lever 14 pivoted at 15, has In 44 and 45 which guide its movement in suitable openings of the casinr l of the lamp. One of the said lugs, or instance the lug 44, has cast with, or secured to, it a toothed quadrant 11' which meshes with a. pinlon 10 secured to a toothed wheel 9. The latter by means of a pinion 8 and wheel 7 secured to each other, transmits the movement of the quadrant 11, to a pinion 6 mounted on the spindle of the magnet. This arrangement has the advantage of making possible a direct driving-of the accelerator gear by the lever itself, without interposition of connecting rods, as providedin the above noted application. The pinion 6 during its rotation drives the ratchet wheel 13 secured to it and transmitting its movement by means of a, pawl 19, in one direction only to the magnet 4 loosely mounted on the spindle 5.

Springs 20 resting on the wall of the casing 1 and secured to the trunnions of the lugs 44 and 45, have the tendency to keep the lever 14 raised, that is to sav in its open position. But the latter is held back against the said movement by a lever 46 pivoted at 47 and held by a spring 48 in constant contact with the edge of the lug 45 in such a manner that the lip 49 of the lever 46 slides on the said edge during the movement of the lever and gets into a notch 50 as soon as it meets it, that is to say as soon as the lever 14 is in its closing position. In order to raise the lever 14 and enable it to be operated, it is necessary to swing back the lever 46 in order to disengage it from the notch, by pressing on a push button 51 which is connected to it by a pin 52 which can be moved to and from in a. suitable slot pro vided in the wall of the casing 1.

It is advantageous to arrange round all the slots existing in the casing l, packing joints which press against the movable parts such as the lever 14 and the push button 51. and can be constituted for instance by leather packing 53 secured to the casing by means of metal plates 54 and pressed whereever it may be necessary by springs 55. In this way, all the joints of the casing are made so tight that the possibility of water entering it is minimized This improved device for driving the rotary magnet works as follows:

To make use of the lamp, holding it in the hand the push button 51 is slid back with ratchet wheell13 through the intermediary of the wheels and pinions ltl, 9, 8, 7 and 6, without driving the magnet 4. the pawl slipping on the ratchet wheel 13. A. pressure istheu exerted {on the lever L4, and the accelerator gear is operated in the reverse di-g rection by the quadrant 11, the ratchet wheel 1?) driving in its movement the magnet 4 by means of the pawl 19; As soon as the action of the-lever 14 ceases, it will bebrought by its springs ilfl-back to. its posi- -tion and the ratchet wheel, 13 will rotate in the opposite direction to the magnetwhich will alone continue its forward movement without producing by its rotation any driv ing of the acceleraton gear and therefore without producing objectionable noise.

In order to simplify the manufacture of the said ocket lamp, it could be made of cast aluminium and provided in the interior .of the casing-as shown in the drawing-- with cast on porforatedbosses intended to receive the various spindles of the toothed wheels; this arrangement is very favourable for, as the majority of the said spindles can be mounted so as to overhang, it makes it possible to ensure for them a bearing surface suflicient to avoid any excessive play.

As already stated, the improvements according to the resent invention, relate also to the means or supporting the rotating magnet. In the constructions shown in Figs. 3-5, the magnets are rigidly held on' their support, whilst they can of course rotate about their spindle.

(hi the spindle 5 provided with a long bearing 5", are mounted two magnetic elements 4 and 4, the branches of each of which forman angle of 90 (see Figs. 3 and 4). The bearing 5 has spaced cxtensionsfi". which are bent angularly into the recesses formed between the angularly disposed branches of the magnetic elements whereby the latter are held against radial displacement when they are pressed against the disc 5* by a nut 56 which is screwed on a screwthreaded portion of the spindle.

in the construction shown in Fig. three magnetic elements 4, 4* and 4", the branches of which form an angle of 60, are mounted on the spindle 5 and rest against the bearing 5 to which they are secured by means of screws or in some way. 'lhemethods of fixing the magnetic elements to the bearing of the spindle are, besides, given merely by way of example and can be carried out in ;::l\' suitable manner withoutaltering the 1ihi'iplc of the system. Each of the ma g iv'iit' elements is joined to the adjacent clefprovided in the elements tation should become- 'ment or elements along radial junction lines,

and whatever be their number, the poles are always alternately north and. south when they are erected on the driving bearing.

These same elements are arranged in Figs. 6-8so as'to obtain by an automatic regulation of the current an absolutely constant luminous ,intensityof the lamp.

On the spindle 5 carrying the disc 5*, are mounted the two bipolar elements 4 and 4 (Figs 6 and 7')" the inner lateral faces of whichare pressed against each other by the springs 57 which/have the tendency to bring them closer o the spindle 5. The disc 5 has guides 53 erigagingwith oblique mortises' 59 a parallel to their line of junction. r

"When the magnetis rotatingvat its normal working speed, no movement of the elements 4'and 4" takes place; but if the speed of roeat, the said elements, under the action 0 centrifugal force, move away. from the centre to a. distance which is'a function ofqthe'said speed. The gap existin gbetween the polar. bore and the armature increases, .which results in. the intensity ,of the magnetic field being reduced and in theelectromotive foroebem maintained within suitable limits. In

tromotive force which to a certain extent is independent of the speed of rotation of the ma net;

he magnetshown 'inFi 8 is a multiple one, and its elements 4 and 4 are mounted on the bearing 5 of the spindle 5 in a manner similar to that just described, in order that they should be able to move awe; from the spindle under the action of een'tri al force. To that end, they are nprovided wi hradial mortises 59 normal to the line ofiunction of the elements; with which on age guides 58 "screwed late the bearing 5'. hey'are moreover conn'ected by springs'57whieh constantly tend to bring them nearer to the Spindle, and it is only when "the speed 'of rotation be comes too great, and the centrifugal force overcomes the tension of the'sprmgs that the magnetic elements move away from each other. y i v The automatic regulation of the electromotive force in the electricity generator results in ensuring constant intensity of ii hting of the lamp, as soon as a certain spee of rotation is reached by the magnet, and in preventing, in case of an excessive speed, the filament of the lamp bulb from beingdestroyed. i i I It is obvious that the various arrange ments described by way of example could be modified within certain limits without altering the principle of the system. Thus the shape or the arrangement of the various parts of the lamp could be varied, and any suitable method of erecting. guiding and p is way. automatic regulation is obtained of the elecretul lnilfgitl-ieflelements of the magnet, could be emplo ed for obtaining regulation of the gap by tlie' action of centrifugal force.

These magnet constructions designed for obtaining, automatic regulation of the in.- duced electromotive force, are more articularly applicable to electro-mechanica lamps for bicycles, driven by one of the wheels of the vehicle,,,the speed of which constantly varies within wide limits.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is Q 1. In an electric pocket lamp, an electromagnetic generator including an armature and a permanent field maget composed of two parts having the parts contactin alon a plane surface, and means to norma ly an resiliently retain the parts of the field magnet in engagement, and guiding means for the field magnet parts, whereby movement thereof in translation by a centrifugal force is effected.

: 2. In an electric pocket lamp, an electromagnetic generator including an armature,

a two-part permanent field magnet having the parts thereof contacting along a (liemetrlca-l plane of the axis of rotation thereof, means tending to draw the parts of the field magnet together, a support for the field magnet, a plate attached to said support, and guide means carried by said plate and-engaginlg the parts of said field magnet.

3. -n an electric pocket lamp, an electromagnetic generator including an armature, a permanent two-part cruciform field magnet having the parts thereof normally contacting of a plane diametrical along the axis of rotation thereof, means supporting the field magnet, coiled springs connecting the parts of the magnet and normally tending to draw the latter together said magnet parts having ide grooves disposed perpendicular to t 1e line of contact between the parts thereof, a plate carried by the su porting means, and guide lugs carried by t a plate en aging in said grooves.

11 testimony whereof I have signed my name to this specification.

Air'romn LUZY. 

